/usr/lib/python2.7/dist-packages/sage/interacts/ is in sagemath-common 8.1-7ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/python2.7/dist-packages/sage/interacts/__init__.py
/usr/lib/python2.7/dist-packages/sage/interacts/algebra.py
/usr/lib/python2.7/dist-packages/sage/interacts/all.py
/usr/lib/python2.7/dist-packages/sage/interacts/calculus.py
/usr/lib/python2.7/dist-packages/sage/interacts/debugger.py
/usr/lib/python2.7/dist-packages/sage/interacts/decorator.py
/usr/lib/python2.7/dist-packages/sage/interacts/fractals.py
/usr/lib/python2.7/dist-packages/sage/interacts/geometry.py
/usr/lib/python2.7/dist-packages/sage/interacts/library.py
/usr/lib/python2.7/dist-packages/sage/interacts/statistics.py